export function formatDateTime(utcString) {
  const date = new Date(utcString);
  const options = {
    year: 'numeric',
    month: 'long',
    day: 'numeric',
    hour: '2-digit',
    minute: '2-digit',
    second: '2-digit',
    hour12: false
  };
  return date.toLocaleString('zh-CN', options).replace(/年|月/g, match => match + ' ').replace('日', '日 ');
}